MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
An object immersed in a liquid loses weight because of which of the following?
Think it through first, then pick an option.
- a the upward force
- b the downward force
- c the side pressure of the liquid
- d the air pressure above the liquid
Answer and explanation
Correct answer: a the upward force
The liquid pushes the object upward; this upward force is the buoyancy, so the object seems lighter.
Why the other options are wrong
- b the downward force: A downward force would add to the weight, not reduce it; the loss comes from the upward force.
- c the side pressure of the liquid: The side forces are equal and opposite and cancel one another; they do not reduce the weight.
- d the air pressure above the liquid: Air pressure is not the cause; the upward force of the liquid, the buoyancy, is.
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